资料来源 : Webster's Revised Unabridged Dictionary (1913)

Tunnel \Tun"nel\, v. t. [imp. & p. p. {Tunneled}or {Tunnelled};
   p. pr. & vb. n. {Tunneling} or {Tunnelling}.]
   1. To form into a tunnel, or funnel, or to form like a
      tunnel; as, to tunnel fibrous plants into nests. --Derham.

   2. To catch in a tunnel net.

   3. To make an opening, or a passageway, through or under; as,
      to tunnel a mountain; to tunnel a river.

资料来源 : WordNet®

tunnel
     n 1: a passageway through or under something, usually underground
          (especially one for trains or cars); "the tunnel reduced
          congestion at that intersection"
     2: a hole in the ground made by an animal for shelter [syn: {burrow}]
     v 1: move through by or as by digging; "burrow through the
          forest" [syn: {burrow}]
     2: force a way through
     [also: {tunnelling}, {tunnelled}]

tunnelled
     See {tunnel}